Nucleosynthesis for a Life - Max Planck Societyjcg/ROD_Retirement2019/Aharonian.pdfF.A. Aharonian...
Transcript of Nucleosynthesis for a Life - Max Planck Societyjcg/ROD_Retirement2019/Aharonian.pdfF.A. Aharonian...
Nuclear gamma-rays from hot accretion flows
Felix Aharonian DIAS/Dublin and MPIK/Heidelberg
Nucleosynthesis for a Life: A symposium in honour of R. Diehl
MPE, Munich, Feb 8, 2019
prompt de-excitation gamma-ray lines:
unique messengers of information about sub-relativistic Nonthermal Universe
initiated by suprathermal CRs - energy range 1 to 100 MeV implications: solar flares (main energy release)
star forming regions (ionisation, chemistry) SNRs - problem of injection
ISM - pressure …………… - realization - so far, not impressive (except for Solar Flares) the status of “de-excitation gamma-ray line” astronomy - same as in the 1970s
- reason - low efficiency of production (10-5 or less) and lack of sensitive MeV detectors
- future - ?? , partly eASTROGAM, …
100 MeV does not necessarily imply “nonthermal”
formation of hot 1010 K to 1012 K plasmas?
due to accretion on neutron stars and black holes
termination of sub-relativistic shocks: v ~ 0.03-0.3 c
typically two-temperature plasmas with Ti >> Te
de-excitation lines - the best carriers of information about two-temperature plasmas!
radiation efficiency? - somewhat better than in non thermal scenarios!
my “entrance” to Astrophysics started with prompt gamma-ray lines
motivation “rich” physics where I could use my knowledge in nuclear physics
but also
disappointment low radiation efficiency + low performance of MeV detectors
=> shift of interest to (very) higher energies
F.A. Aharonian and R.A. Sunyaev
35 years old almost unnoticed (only 48 citations!) paper
Science with e-ASTROGAMJournal of High Energy Astrophysics, Volume 19, p. 1-106
New interest to the topic:
Gamma-ray line formation in hot plasmas - result of operation of large amount of excitation and spallation reactions in 1-100 MeV region
=> detailed nuclear reaction codes are required now available (e.g. TALYS) !
New detectors: eASTROMAG
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very good resolution for broad γ-ray lines!
adequate performance for meaningful probes
Phys. Rev D, 2019, accepted
A&A, 2019, accepted
Emissivity of radiation at three different epochs: 10-5 s, 10-2 s, 1 sec
Evolution of Chemical composition
kTi=50 MeV, kTe=100 keV; n=1017 cm-3; solar composition
kTe=100 keV; n=1017 cm-3; solar composition
kTi=30 MeV
kTi=100 MeV
Evolution of Chemical composition Emissivity of radiation at 10-5 s
chemical evolution with radius r=R/Rs luminosity
principal parameters:
viscosity α
ΒΗ mass m=Μ/Μo =10
accretion rate
m = M/MEdd<latexit sha1_base64="RKEtZ16jxaxrCcYwrpbfNqh+97c=">AAACD3icbVDLSgMxFM3UV62vUZdugkVxVWdE0I1QFMGNUME+oB2GTCZtQ5PMkGSEMswfuPFX3LhQxK1bd/6NmXYW2nog5HDOvTe5J4gZVdpxvq3SwuLS8kp5tbK2vrG5ZW/vtFSUSEyaOGKR7ARIEUYFaWqqGenEkiAeMNIORle5334gUtFI3OtxTDyOBoL2KUbaSL592JMc9sJIpzy7mJLb7Li4/TR3r8Mw8+2qU3MmgPPELUgVFGj49peZgRNOhMYMKdV1nVh7KZKaYkaySi9RJEZ4hAaka6hAnCgvneyTwQOjhLAfSXOEhhP1d0eKuFJjHphKjvRQzXq5+J/XTXT/3EupiBNNBJ4+1E8Y1BHMw4EhlQRrNjYEYUnNXyEeIomwNhFWTAju7MrzpHVSc52ae3darV8WcZTBHtgHR8AFZ6AObkADNAEGj+AZvII368l6sd6tj2lpySp6dsEfWJ8/CE6cpQ==</latexit><latexit sha1_base64="RKEtZ16jxaxrCcYwrpbfNqh+97c=">AAACD3icbVDLSgMxFM3UV62vUZdugkVxVWdE0I1QFMGNUME+oB2GTCZtQ5PMkGSEMswfuPFX3LhQxK1bd/6NmXYW2nog5HDOvTe5J4gZVdpxvq3SwuLS8kp5tbK2vrG5ZW/vtFSUSEyaOGKR7ARIEUYFaWqqGenEkiAeMNIORle5334gUtFI3OtxTDyOBoL2KUbaSL592JMc9sJIpzy7mJLb7Li4/TR3r8Mw8+2qU3MmgPPELUgVFGj49peZgRNOhMYMKdV1nVh7KZKaYkaySi9RJEZ4hAaka6hAnCgvneyTwQOjhLAfSXOEhhP1d0eKuFJjHphKjvRQzXq5+J/XTXT/3EupiBNNBJ4+1E8Y1BHMw4EhlQRrNjYEYUnNXyEeIomwNhFWTAju7MrzpHVSc52ae3darV8WcZTBHtgHR8AFZ6AObkADNAEGj+AZvII368l6sd6tj2lpySp6dsEfWJ8/CE6cpQ==</latexit><latexit sha1_base64="RKEtZ16jxaxrCcYwrpbfNqh+97c=">AAACD3icbVDLSgMxFM3UV62vUZdugkVxVWdE0I1QFMGNUME+oB2GTCZtQ5PMkGSEMswfuPFX3LhQxK1bd/6NmXYW2nog5HDOvTe5J4gZVdpxvq3SwuLS8kp5tbK2vrG5ZW/vtFSUSEyaOGKR7ARIEUYFaWqqGenEkiAeMNIORle5334gUtFI3OtxTDyOBoL2KUbaSL592JMc9sJIpzy7mJLb7Li4/TR3r8Mw8+2qU3MmgPPELUgVFGj49peZgRNOhMYMKdV1nVh7KZKaYkaySi9RJEZ4hAaka6hAnCgvneyTwQOjhLAfSXOEhhP1d0eKuFJjHphKjvRQzXq5+J/XTXT/3EupiBNNBJ4+1E8Y1BHMw4EhlQRrNjYEYUnNXyEeIomwNhFWTAju7MrzpHVSc52ae3darV8WcZTBHtgHR8AFZ6AObkADNAEGj+AZvII368l6sd6tj2lpySp6dsEfWJ8/CE6cpQ==</latexit><latexit sha1_base64="RKEtZ16jxaxrCcYwrpbfNqh+97c=">AAACD3icbVDLSgMxFM3UV62vUZdugkVxVWdE0I1QFMGNUME+oB2GTCZtQ5PMkGSEMswfuPFX3LhQxK1bd/6NmXYW2nog5HDOvTe5J4gZVdpxvq3SwuLS8kp5tbK2vrG5ZW/vtFSUSEyaOGKR7ARIEUYFaWqqGenEkiAeMNIORle5334gUtFI3OtxTDyOBoL2KUbaSL592JMc9sJIpzy7mJLb7Li4/TR3r8Mw8+2qU3MmgPPELUgVFGj49peZgRNOhMYMKdV1nVh7KZKaYkaySi9RJEZ4hAaka6hAnCgvneyTwQOjhLAfSXOEhhP1d0eKuFJjHphKjvRQzXq5+J/XTXT/3EupiBNNBJ4+1E8Y1BHMw4EhlQRrNjYEYUnNXyEeIomwNhFWTAju7MrzpHVSc52ae3darV8WcZTBHtgHR8AFZ6AObkADNAEGj+AZvII368l6sd6tj2lpySp6dsEfWJ8/CE6cpQ==</latexit>
gas pressure/total pressure β;
adiabatic index γ;
electron heating/total heating δ;
advection parameter f
m =<latexit sha1_base64="2hYiPGzp2oibRyTAVACFswKpwKA=">AAAB83icbVDLSsNAFL2pr1pfVZduBovgqiQi6EYounFZwT6gCWUynbRDZ5IwcyOU0N9w40IRt/6MO//GaZuFth4YOJxzD/fOCVMpDLrut1NaW9/Y3CpvV3Z29/YPqodHbZNkmvEWS2SiuyE1XIqYt1Cg5N1Uc6pCyTvh+G7md564NiKJH3GS8kDRYSwiwShayfe1Iv4gwVxNb/rVmlt35yCrxCtIDQo0+9UvG2WZ4jEySY3peW6KQU41Cib5tOJnhqeUjemQ9yyNqeImyOc3T8mZVQYkSrR9MZK5+juRU2XMRIV2UlEcmWVvJv7n9TKMroNcxGmGPGaLRVEmCSZkVgAZCM0ZyokllGlhbyVsRDVlaGuq2BK85S+vkvZF3XPr3sNlrXFb1FGGEziFc/DgChpwD01oAYMUnuEV3pzMeXHenY/FaMkpMsfwB87nD+JnkZI=</latexit><latexit sha1_base64="2hYiPGzp2oibRyTAVACFswKpwKA=">AAAB83icbVDLSsNAFL2pr1pfVZduBovgqiQi6EYounFZwT6gCWUynbRDZ5IwcyOU0N9w40IRt/6MO//GaZuFth4YOJxzD/fOCVMpDLrut1NaW9/Y3CpvV3Z29/YPqodHbZNkmvEWS2SiuyE1XIqYt1Cg5N1Uc6pCyTvh+G7md564NiKJH3GS8kDRYSwiwShayfe1Iv4gwVxNb/rVmlt35yCrxCtIDQo0+9UvG2WZ4jEySY3peW6KQU41Cib5tOJnhqeUjemQ9yyNqeImyOc3T8mZVQYkSrR9MZK5+juRU2XMRIV2UlEcmWVvJv7n9TKMroNcxGmGPGaLRVEmCSZkVgAZCM0ZyokllGlhbyVsRDVlaGuq2BK85S+vkvZF3XPr3sNlrXFb1FGGEziFc/DgChpwD01oAYMUnuEV3pzMeXHenY/FaMkpMsfwB87nD+JnkZI=</latexit><latexit sha1_base64="2hYiPGzp2oibRyTAVACFswKpwKA=">AAAB83icbVDLSsNAFL2pr1pfVZduBovgqiQi6EYounFZwT6gCWUynbRDZ5IwcyOU0N9w40IRt/6MO//GaZuFth4YOJxzD/fOCVMpDLrut1NaW9/Y3CpvV3Z29/YPqodHbZNkmvEWS2SiuyE1XIqYt1Cg5N1Uc6pCyTvh+G7md564NiKJH3GS8kDRYSwiwShayfe1Iv4gwVxNb/rVmlt35yCrxCtIDQo0+9UvG2WZ4jEySY3peW6KQU41Cib5tOJnhqeUjemQ9yyNqeImyOc3T8mZVQYkSrR9MZK5+juRU2XMRIV2UlEcmWVvJv7n9TKMroNcxGmGPGaLRVEmCSZkVgAZCM0ZyokllGlhbyVsRDVlaGuq2BK85S+vkvZF3XPr3sNlrXFb1FGGEziFc/DgChpwD01oAYMUnuEV3pzMeXHenY/FaMkpMsfwB87nD+JnkZI=</latexit><latexit sha1_base64="2hYiPGzp2oibRyTAVACFswKpwKA=">AAAB83icbVDLSsNAFL2pr1pfVZduBovgqiQi6EYounFZwT6gCWUynbRDZ5IwcyOU0N9w40IRt/6MO//GaZuFth4YOJxzD/fOCVMpDLrut1NaW9/Y3CpvV3Z29/YPqodHbZNkmvEWS2SiuyE1XIqYt1Cg5N1Uc6pCyTvh+G7md564NiKJH3GS8kDRYSwiwShayfe1Iv4gwVxNb/rVmlt35yCrxCtIDQo0+9UvG2WZ4jEySY3peW6KQU41Cib5tOJnhqeUjemQ9yyNqeImyOc3T8mZVQYkSrR9MZK5+juRU2XMRIV2UlEcmWVvJv7n9TKMroNcxGmGPGaLRVEmCSZkVgAZCM0ZyokllGlhbyVsRDVlaGuq2BK85S+vkvZF3XPr3sNlrXFb1FGGEziFc/DgChpwD01oAYMUnuEV3pzMeXHenY/FaMkpMsfwB87nD+JnkZI=</latexit>
10-3 initial solar composition; α=0.1; f=0.86
π0 Maxwellsharp cutoff at 4kTpower-law after 4kT
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0.0153 α=0.3
Solarcomposition
In the ADAF regime, total gamma-ray line luminosity varies between 3x1031 - 1033 erg/s
in principle, can achieve 1034 erg/s for the “heavy initial composition
π0 decay gamma-ray luminosities between 1034 - 3 1035 erg/s
sensitivity eASTROGAM: at MeV energies 1033 (d/1kpc)2 erg/s around 100 MeV 1032 (d/1kpc)2 erg/s
detection of gamma-ray lines? yes, if we are lucky
detection of π0 decay gamma-rays? yes
but why we did not detect so far with Fermi LAT?